Steel door



G. E. STEVENSON Aug. 28, 1928.

STEEL DOOR Filed Dec. 15, 1927 INVENTOR George EJZerenJarg, BY

ATTORNEYS Patented Aug. 28, 1928.

UNITED STATES PATENT OFFICE.

GEORGE E. STEVENSON, OF INDIANAPOLIS, INDIANA.

STEEL DOOR.

The object of my invention is to produce a flexible metal-cored curtain.

The accompanying drawings illustrate my invention.

Fig. 1 is an elevation of a door with my improved curtain in place; Fig. 2 an end elevation of my improved curtain; Fig. 3 a fragmentary inside elevation thereof; Fig. 4 a perspective of one of the core sections; Fig. 5 a perspective of the blank from which a core section is produced, and Fig. 6 an end elevation of one section of my curtain.

In the drawings 10 indicates a strip of suitable sheet metal which is perforated and slot ted at 11 so that the edges may be folded over towards each other to form the core element 12 shown in Fig. 1 having the separated and interdigitable hinge lugs 13. WVelded, or otherwise suitably secured, upon the outer face of each element 12 is a finish plate or strip 14 having a width such that when a curtain is formed by a series of pivotally connected elements, the edges thereof will abut the edges of adjacent plates when the curtain is in extended position. WVelded, or otherwise suitably secured, upon the inner face of each element 12 is a finish plate or strip 15 which covers the adjacent edges of plate 10, and is preferably of such width and has its edges so formed as to fill the space between the opposed series of lugs 13 and fit against the cooperating lugs of adjacent core elements so as to form an inner curtain face as nearly smooth as is consistent with the ability to bend, as indicated in Fig. 2.

I claim as my invention A flexible curtain composed of a plurality of hingedly connected elements each of which comprises a sheet metal core perforated, slotted and its edges overlapped upon its middle to form hinge eyes, and a finish strip secured to the core member and having a width such that the edges thereof will abut edges of similar plates of adjacent core elements when the curtain is flattened.

In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this th day of September, A. D. one thousand nine hundred and twenty-seven.

GEORGE E. STEVENSON. 

